Relief airport
Encyclopedia
Relief airport is used to describe any airport
Airport
An airport is a location where aircraft such as fixed-wing aircraft, helicopters, and blimps take off and land. Aircraft may be stored or maintained at an airport...

 that is built or designated to provide relief or additional capacity to an area when the primary commercial airport(s) reach capacity. In some cases a relief airport is an existing one that is designated to handle a specific class of aircraft such as general aviation
General aviation
General aviation is one of the two categories of civil aviation. It refers to all flights other than military and scheduled airline and regular cargo flights, both private and commercial. General aviation flights range from gliders and powered parachutes to large, non-scheduled cargo jet flights...

.

The advantages of adding an additional airport are clear. Less obvious are the capacity gains from moving general aviation from a commercial airport to a different facility. By removing aircraft with lower capacities and slower speeds, an airport is able to operate more flights with larger aircraft and handle more passengers increasing efficiency with minimal additional cost in facilities at the older and generally larger facility.

This also spreads out the aircraft over a wider area generally improving air traffic
Air Traffic
Air Traffic was a British alternative rock band from Bournemouth. Formed in 2003, the band consists of Chris Wall , David Ryan Jordan , Tom Pritchard and Jim Maddock ....

in the entire community.
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